OEM Carrier 40VA Control Transformer for Model PG8JAA048110AAJA

The Carrier HT01BC116 is the factory-specified step-down control transformer for the PG8JAA048110AAJA packaged gas/electric unit. It converts 120V line voltage to the 24V AC signal that powers your thermostat, control board, gas valve, and every other low-voltage component in the system. When this transformer fails, the entire control circuit loses power — the result is a completely unresponsive unit: no call for heat or cooling, no fan operation, and no thermostat communication. A blown transformer is often caused by a short or ground fault downstream, so always inspect low-voltage wiring before installing the replacement.

• Specs: 120V primary | 24V secondary | 40VA rating | Factory OEM part number HT01BC116 | Meets original factory electrical specifications
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact VA and voltage tolerances. Generic units often run under-rated VA, causing thermal shutdowns under peak control-circuit load — especially in multi-stage or communicating systems.
• Install Difficulty: 2/5 — Disconnect power and verify voltage is absent before beginning. Tools needed: multimeter, flathead and Phillips screwdrivers, wire stripper, needle-nose pliers. Label or photograph all low-voltage wiring connections before removal. Note: always check for downstream shorts before energizing the new transformer.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PG8JAA048110AAJA packaged gas/electric units. Verify primary voltage (120V) and VA rating on your unit's data plate or existing transformer label before ordering. Have questions about fitment? Our HVAC parts team confirms compatibility before you buy.